Sofa



FIG. 1 is a front elevational view of a sofa, showing my new design;

FIG. 2 is a front and side perspective view thereof;

FIG. 3 is a side elevational view, taken from the left of FIG. 1, the side elevational view from the right of FIG. 1 being the mirror image thereof;

FIG. 4 is a rear and side perspective view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a top plan view thereof. 

The ornamental design for a sofa, as shown and described. 